def _prepare_fake_distdir(settings, alist):
	orig_distdir = settings["DISTDIR"]
	edpath = os.path.join(settings["PORTAGE_BUILDDIR"], "distdir")
	portage.util.ensure_dirs(edpath, gid=portage_gid, mode=0o755)

	# Remove any unexpected files or directories.
	for x in os.listdir(edpath):
		symlink_path = os.path.join(edpath, x)
		st = os.lstat(symlink_path)
		if x in alist and stat.S_ISLNK(st.st_mode):
			continue
		if stat.S_ISDIR(st.st_mode):
			shutil.rmtree(symlink_path)
		else:
			os.unlink(symlink_path)

	# Check for existing symlinks and recreate if necessary.
	for x in alist:
		symlink_path = os.path.join(edpath, x)
		target = os.path.join(orig_distdir, x)
		try:
			link_target = os.readlink(symlink_path)
		except OSError:
			os.symlink(target, symlink_path)
		else:
			if link_target != target:
				os.unlink(symlink_path)
				os.symlink(target, symlink_path)

def _archive_copy(src_st, src_path, dest_path):
	"""
	Copy file from src_path to dest_path. Regular files and symlinks
	are supported. If an EnvironmentError occurs, then it is logged
	to stderr.

	@param src_st: source file lstat result
	@type src_st: posix.stat_result
	@param src_path: source file path
	@type src_path: str
	@param dest_path: destination file path
	@type dest_path: str
	"""
	# Remove destination file in order to ensure that the following
	# symlink or copy2 call won't fail (see bug #535850).
	try:
		os.unlink(dest_path)
	except OSError:
		pass
	try:
		if stat.S_ISLNK(src_st.st_mode):
			os.symlink(os.readlink(src_path), dest_path)
		else:
			shutil.copy2(src_path, dest_path)
	except EnvironmentError as e:
		portage.util.writemsg(
			_('dispatch-conf: Error copying %(src_path)s to '
			'%(dest_path)s: %(reason)s\n') % {
				"src_path": src_path,
				"dest_path": dest_path,
				"reason": e
			}, noiselevel=-1)

def _prepare_fake_filesdir(settings):
	real_filesdir = settings["O"]+"/files"
	symlink_path = settings["FILESDIR"]

	try:
		link_target = os.readlink(symlink_path)
	except OSError:
		os.symlink(real_filesdir, symlink_path)
	else:
		if link_target != real_filesdir:
			os.unlink(symlink_path)
			os.symlink(real_filesdir, symlink_path)

		def modify_files(dir_path):
			for name in os.listdir(dir_path):
				path = os.path.join(dir_path, name)
				st = os.lstat(path)
				if stat.S_ISREG(st.st_mode):
					with io.open(path, mode='a',
						encoding=_encodings["stdio"]) as f:
						f.write("modified at %d\n" % time.time())
				elif stat.S_ISLNK(st.st_mode):
					old_dest = os.readlink(path)
					os.unlink(path)
					os.symlink(old_dest +
						" modified at %d" % time.time(), path)

	def _create_symlink(self, cpv):
		"""Create a ${PKGDIR}/${CATEGORY}/${PF}.tbz2 symlink (and
		${PKGDIR}/${CATEGORY} directory, if necessary).  Any file that may
		exist in the location of the symlink will first be removed."""
		mycat, mypkg = catsplit(cpv)
		full_path = os.path.join(self.pkgdir, mycat, mypkg + ".tbz2")
		self._ensure_dir(os.path.dirname(full_path))
		try:
			os.unlink(full_path)
		except OSError as e:
			if e.errno != errno.ENOENT:
				raise
			del e
		os.symlink(os.path.join("..", "All", mypkg + ".tbz2"), full_path)

	def commit_update(self):
		update_location = self.current_update
		self._update_location = None
		try:
			snapshots = [int(name) for name in os.listdir(self._snapshots_dir)]
		except OSError:
			snapshots = []
			portage.util.ensure_dirs(self._snapshots_dir)
			portage.util.apply_stat_permissions(self._snapshots_dir,
				os.stat(self._storage_location))
		if snapshots:
			new_id = max(snapshots) + 1
		else:
			new_id = 1
		os.rename(update_location, os.path.join(self._snapshots_dir, str(new_id)))
		new_symlink = self._latest_symlink + '.new'
		try:
			os.unlink(new_symlink)
		except OSError:
			pass
		os.symlink('snapshots/{}'.format(new_id), new_symlink)
		os.rename(new_symlink, self._latest_symlink)

		try:
			user_location_correct = os.path.samefile(self._user_location, self._latest_symlink)
		except OSError:
			user_location_correct = False

		if not user_location_correct:
			new_symlink = self._user_location + '.new'
			try:
				os.unlink(new_symlink)
			except OSError:
				pass
			os.symlink(self._latest_symlink, new_symlink)
			os.rename(new_symlink, self._user_location)

		coroutine_return()
		yield None

#.........这里部分代码省略.........
	except ValueError as e:
		if len(str(e)) > 0:
			writemsg("%s\n" % e)
		writemsg(_("!!! Unable to parse PORTAGE_WORKDIR_MODE='%s', using %s.\n") % \
		(mysettings["PORTAGE_WORKDIR_MODE"], oct(workdir_mode)))
	mysettings["PORTAGE_WORKDIR_MODE"] = oct(workdir_mode).replace('o', '')
	try:
		apply_secpass_permissions(mysettings["WORKDIR"],
		uid=portage_uid, gid=portage_gid, mode=workdir_mode)
	except FileNotFound:
		pass # ebuild.sh will create it

	if mysettings.get("PORTAGE_LOGDIR", "") == "":
		while "PORTAGE_LOGDIR" in mysettings:
			del mysettings["PORTAGE_LOGDIR"]
	if "PORTAGE_LOGDIR" in mysettings:
		try:
			modified = ensure_dirs(mysettings["PORTAGE_LOGDIR"])
			if modified:
				# Only initialize group/mode if the directory doesn't
				# exist, so that we don't override permissions if they
				# were previously set by the administrator.
				# NOTE: These permissions should be compatible with our
				# default logrotate config as discussed in bug 374287.
				apply_secpass_permissions(mysettings["PORTAGE_LOGDIR"],
					uid=portage_uid, gid=portage_gid, mode=0o2770)
		except PortageException as e:
			writemsg("!!! %s\n" % str(e), noiselevel=-1)
			writemsg(_("!!! Permission issues with PORTAGE_LOGDIR='%s'\n") % \
				mysettings["PORTAGE_LOGDIR"], noiselevel=-1)
			writemsg(_("!!! Disabling logging.\n"), noiselevel=-1)
			while "PORTAGE_LOGDIR" in mysettings:
				del mysettings["PORTAGE_LOGDIR"]

	compress_log_ext = ''
	if 'compress-build-logs' in mysettings.features:
		compress_log_ext = '.gz'

	logdir_subdir_ok = False
	if "PORTAGE_LOGDIR" in mysettings and \
		os.access(mysettings["PORTAGE_LOGDIR"], os.W_OK):
		logdir = normalize_path(mysettings["PORTAGE_LOGDIR"])
		logid_path = os.path.join(mysettings["PORTAGE_BUILDDIR"], ".logid")
		if not os.path.exists(logid_path):
			open(_unicode_encode(logid_path), 'w').close()
		logid_time = _unicode_decode(time.strftime("%Y%m%d-%H%M%S",
			time.gmtime(os.stat(logid_path).st_mtime)),
			encoding=_encodings['content'], errors='replace')

		if "split-log" in mysettings.features:
			log_subdir = os.path.join(logdir, "build", mysettings["CATEGORY"])
			mysettings["PORTAGE_LOG_FILE"] = os.path.join(
				log_subdir, "%s:%s.log%s" %
				(mysettings["PF"], logid_time, compress_log_ext))
		else:
			log_subdir = logdir
			mysettings["PORTAGE_LOG_FILE"] = os.path.join(
				logdir, "%s:%s:%s.log%s" % \
				(mysettings["CATEGORY"], mysettings["PF"], logid_time,
				compress_log_ext))

		if log_subdir is logdir:
			logdir_subdir_ok = True
		else:
			try:
				_ensure_log_subdirs(logdir, log_subdir)
			except PortageException as e:
				writemsg("!!! %s\n" % (e,), noiselevel=-1)

			if os.access(log_subdir, os.W_OK):
				logdir_subdir_ok = True
			else:
				writemsg("!!! %s: %s\n" %
					(_("Permission Denied"), log_subdir), noiselevel=-1)

	tmpdir_log_path = os.path.join(
		mysettings["T"], "build.log%s" % compress_log_ext)
	if not logdir_subdir_ok:
		# NOTE: When sesandbox is enabled, the local SELinux security policies
		# may not allow output to be piped out of the sesandbox domain. The
		# current policy will allow it to work when a pty is available, but
		# not through a normal pipe. See bug #162404.
		mysettings["PORTAGE_LOG_FILE"] = tmpdir_log_path
	else:
		# Create a symlink from tmpdir_log_path to PORTAGE_LOG_FILE, as
		# requested in bug #412865.
		make_new_symlink = False
		try:
			target = os.readlink(tmpdir_log_path)
		except OSError:
			make_new_symlink = True
		else:
			if target != mysettings["PORTAGE_LOG_FILE"]:
				make_new_symlink = True
		if make_new_symlink:
			try:
				os.unlink(tmpdir_log_path)
			except OSError:
				pass
			os.symlink(mysettings["PORTAGE_LOG_FILE"], tmpdir_log_path)

#.........这里部分代码省略.........
							writemsg(_(">>> Renaming distfile with size "
								"%d (smaller than " "PORTAGE_FETCH_RESU"
								"ME_MIN_SIZE)\n") % mystat.st_size)
							temp_filename = \
								_checksum_failure_temp_file(
								mysettings["DISTDIR"], myfile)
							writemsg_stdout(_("Refetching... "
								"File renamed to '%s'\n\n") % \
								temp_filename, noiselevel=-1)
						elif mystat.st_size >= size:
							temp_filename = \
								_checksum_failure_temp_file(
								mysettings["DISTDIR"], myfile)
							writemsg_stdout(_("Refetching... "
								"File renamed to '%s'\n\n") % \
								temp_filename, noiselevel=-1)

				if distdir_writable and ro_distdirs:
					readonly_file = None
					for x in ro_distdirs:
						filename = os.path.join(x, myfile)
						match, mystat = _check_distfile(
							filename, pruned_digests, eout, hash_filter=hash_filter)
						if match:
							readonly_file = filename
							break
					if readonly_file is not None:
						try:
							os.unlink(myfile_path)
						except OSError as e:
							if e.errno not in (errno.ENOENT, errno.ESTALE):
								raise
							del e
						os.symlink(readonly_file, myfile_path)
						continue

				# this message is shown only after we know that
				# the file is not already fetched
				if not has_space:
					writemsg(_("!!! Insufficient space to store %s in %s\n") % \
						(myfile, mysettings["DISTDIR"]), noiselevel=-1)

					if has_space_superuser:
						writemsg(_("!!! Insufficient privileges to use "
							"remaining space.\n"), noiselevel=-1)
						if userfetch:
							writemsg(_("!!! You may set FEATURES=\"-userfetch\""
								" in /etc/make.conf in order to fetch with\n"
								"!!! superuser privileges.\n"), noiselevel=-1)

				if fsmirrors and not os.path.exists(myfile_path) and has_space:
					for mydir in fsmirrors:
						mirror_file = os.path.join(mydir, myfile)
						try:
							shutil.copyfile(mirror_file, myfile_path)
							writemsg(_("Local mirror has file: %s\n") % myfile)
							break
						except (IOError, OSError) as e:
							if e.errno not in (errno.ENOENT, errno.ESTALE):
								raise
							del e

				try:
					mystat = os.stat(myfile_path)
				except OSError as e:
					if e.errno not in (errno.ENOENT, errno.ESTALE):

	def _create_profile(self, ebuilds, installed, profile, repo_configs, user_config, sets):

		user_config_dir = os.path.join(self.eroot, USER_CONFIG_PATH)

		try:
			os.makedirs(user_config_dir)
		except os.error:
			pass

		for repo in self.repo_dirs:
			repo_dir = self._get_repo_dir(repo)
			profile_dir = os.path.join(self._get_repo_dir(repo), "profiles")
			metadata_dir = os.path.join(repo_dir, "metadata")
			os.makedirs(metadata_dir)

			#Create $REPO/profiles/categories
			categories = set()
			for cpv in ebuilds:
				ebuilds_repo = Atom("="+cpv, allow_repo=True).repo
				if ebuilds_repo is None:
					ebuilds_repo = "test_repo"
				if ebuilds_repo == repo:
					categories.add(catsplit(cpv)[0])

			categories_file = os.path.join(profile_dir, "categories")
			f = open(categories_file, "w")
			for cat in categories:
				f.write(cat + "\n")
			f.close()
			
			#Create $REPO/profiles/license_groups
			license_file = os.path.join(profile_dir, "license_groups")
			f = open(license_file, "w")
			f.write("EULA TEST\n")
			f.close()

			repo_config = repo_configs.get(repo) 
			if repo_config:
				for config_file, lines in repo_config.items():
					if config_file not in self.config_files:
						raise ValueError("Unknown config file: '%s'" % config_file)

					if config_file in ("layout.conf",):
						file_name = os.path.join(repo_dir, "metadata", config_file)
					else:
						file_name = os.path.join(profile_dir, config_file)
					f = open(file_name, "w")
					for line in lines:
						f.write("%s\n" % line)
					f.close()

			#Create $profile_dir/eclass (we fail to digest the ebuilds if it's not there)
			os.makedirs(os.path.join(repo_dir, "eclass"))

			if repo == "test_repo":
				#Create a minimal profile in /usr/portage
				sub_profile_dir = os.path.join(profile_dir, "default", "linux", "x86", "test_profile")
				os.makedirs(sub_profile_dir)

				eapi_file = os.path.join(sub_profile_dir, "eapi")
				f = open(eapi_file, "w")
				f.write("0\n")
				f.close()

				make_defaults_file = os.path.join(sub_profile_dir, "make.defaults")
				f = open(make_defaults_file, "w")
				f.write("ARCH=\"x86\"\n")
				f.write("ACCEPT_KEYWORDS=\"x86\"\n")
				f.close()

				use_force_file = os.path.join(sub_profile_dir, "use.force")
				f = open(use_force_file, "w")
				f.write("x86\n")
				f.close()

				parent_file = os.path.join(sub_profile_dir, "parent")
				f = open(parent_file, "w")
				f.write("..\n")
				f.close()

				if profile:
					for config_file, lines in profile.items():
						if config_file not in self.config_files:
							raise ValueError("Unknown config file: '%s'" % config_file)

						file_name = os.path.join(sub_profile_dir, config_file)
						f = open(file_name, "w")
						for line in lines:
							f.write("%s\n" % line)
						f.close()

				#Create profile symlink
				os.symlink(sub_profile_dir, os.path.join(user_config_dir, "make.profile"))

				#Create minimal herds.xml
				herds_xml = """<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE herds SYSTEM "http://www.gentoo.org/dtd/herds.dtd">
<?xml-stylesheet href="/xsl/herds.xsl" type="text/xsl" ?>
<?xml-stylesheet href="/xsl/guide.xsl" type="text/xsl" ?>
<herds>
#.........这里部分代码省略.........

	def testBlockerFileCollision(self):

		debug = False

		install_something = """
S="${WORKDIR}"

src_install() {
	einfo "installing something..."
	insinto /usr/lib
	echo "${PN}" > "${T}/file-collision"
	doins "${T}/file-collision"
}
"""

		ebuilds = {
			"dev-libs/A-1" : {
				"EAPI": "6",
				"MISC_CONTENT": install_something,
				"RDEPEND":  "!dev-libs/B",
			},
			"dev-libs/B-1" : {
				"EAPI": "6",
				"MISC_CONTENT": install_something,
				"RDEPEND":  "!dev-libs/A",
			},
		}

		playground = ResolverPlayground(ebuilds=ebuilds, debug=debug)
		settings = playground.settings
		eprefix = settings["EPREFIX"]
		eroot = settings["EROOT"]
		var_cache_edb = os.path.join(eprefix, "var", "cache", "edb")
		user_config_dir = os.path.join(eprefix, USER_CONFIG_PATH)

		portage_python = portage._python_interpreter
		emerge_cmd = (portage_python, "-b", "-Wd",
			os.path.join(self.bindir, "emerge"))

		file_collision = os.path.join(eroot, 'usr/lib/file-collision')

		test_commands = (
			emerge_cmd + ("--oneshot", "dev-libs/A",),
			(lambda: portage.util.grablines(file_collision) == ["A\n"],),
			emerge_cmd + ("--oneshot", "dev-libs/B",),
			(lambda: portage.util.grablines(file_collision) == ["B\n"],),
			emerge_cmd + ("--oneshot", "dev-libs/A",),
			(lambda: portage.util.grablines(file_collision) == ["A\n"],),
			({"FEATURES":"parallel-install"},) + emerge_cmd + ("--oneshot", "dev-libs/B",),
			(lambda: portage.util.grablines(file_collision) == ["B\n"],),
			({"FEATURES":"parallel-install"},) + emerge_cmd + ("-Cq", "dev-libs/B",),
			(lambda: not os.path.exists(file_collision),),
		)

		fake_bin = os.path.join(eprefix, "bin")
		portage_tmpdir = os.path.join(eprefix, "var", "tmp", "portage")
		profile_path = settings.profile_path

		path =  os.environ.get("PATH")
		if path is not None and not path.strip():
			path = None
		if path is None:
			path = ""
		else:
			path = ":" + path
		path = fake_bin + path

		pythonpath =  os.environ.get("PYTHONPATH")
		if pythonpath is not None and not pythonpath.strip():
			pythonpath = None
		if pythonpath is not None and \
			pythonpath.split(":")[0] == PORTAGE_PYM_PATH:
			pass
		else:
			if pythonpath is None:
				pythonpath = ""
			else:
				pythonpath = ":" + pythonpath
			pythonpath = PORTAGE_PYM_PATH + pythonpath

		env = {
			"PORTAGE_OVERRIDE_EPREFIX" : eprefix,
			"PATH" : path,
			"PORTAGE_PYTHON" : portage_python,
			"PORTAGE_REPOSITORIES" : settings.repositories.config_string(),
			"PYTHONDONTWRITEBYTECODE" : os.environ.get("PYTHONDONTWRITEBYTECODE", ""),
			"PYTHONPATH" : pythonpath,
		}

		if "__PORTAGE_TEST_HARDLINK_LOCKS" in os.environ:
			env["__PORTAGE_TEST_HARDLINK_LOCKS"] = \
				os.environ["__PORTAGE_TEST_HARDLINK_LOCKS"]

		dirs = [playground.distdir, fake_bin, portage_tmpdir,
			user_config_dir, var_cache_edb]
		true_symlinks = ["chown", "chgrp"]
		true_binary = find_binary("true")
		self.assertEqual(true_binary is None, False,
			"true command not found")
		try:
#.........这里部分代码省略.........

	def testSimple(self):

		debug = False

		install_something = """
S="${WORKDIR}"

pkg_pretend() {
	einfo "called pkg_pretend for $CATEGORY/$PF"
}

src_install() {
	einfo "installing something..."
	insinto /usr/lib/${P}
	echo "blah blah blah" > "${T}"/regular-file
	doins "${T}"/regular-file
	dosym regular-file /usr/lib/${P}/symlink || die

	# Test code for bug #381629, using a copyright symbol encoded with latin-1.
	# We use $(printf "\\xa9") rather than $'\\xa9', since printf apparently
	# works in any case, while $'\\xa9' transforms to \\xef\\xbf\\xbd under
	# some conditions. TODO: Find out why it transforms to \\xef\\xbf\\xbd when
	# running tests for Python 3.2 (even though it's bash that is ultimately
	# responsible for performing the transformation).
	local latin_1_dir=/usr/lib/${P}/latin-1-$(printf "\\xa9")-directory
	insinto "${latin_1_dir}"
	echo "blah blah blah" > "${T}"/latin-1-$(printf "\\xa9")-regular-file || die
	doins "${T}"/latin-1-$(printf "\\xa9")-regular-file
	dosym latin-1-$(printf "\\xa9")-regular-file ${latin_1_dir}/latin-1-$(printf "\\xa9")-symlink || die
}

pkg_config() {
	einfo "called pkg_config for $CATEGORY/$PF"
}

pkg_info() {
	einfo "called pkg_info for $CATEGORY/$PF"
}

pkg_preinst() {
	einfo "called pkg_preinst for $CATEGORY/$PF"

	# Test that has_version and best_version work correctly with
	# prefix (involves internal ROOT -> EROOT calculation in order
	# to support ROOT override via the environment with EAPIs 3
	# and later which support prefix).
	if has_version $CATEGORY/$PN:$SLOT ; then
		einfo "has_version detects an installed instance of $CATEGORY/$PN:$SLOT"
		einfo "best_version reports that the installed instance is $(best_version $CATEGORY/$PN:$SLOT)"
	else
		einfo "has_version does not detect an installed instance of $CATEGORY/$PN:$SLOT"
	fi
}

"""

		ebuilds = {
			"dev-libs/A-1": {
				"EAPI" : "4",
				"IUSE" : "+flag",
				"KEYWORDS": "x86",
				"LICENSE": "GPL-2",
				"MISC_CONTENT": install_something,
				"RDEPEND": "flag? ( dev-libs/B[flag] )",
			},
			"dev-libs/B-1": {
				"EAPI" : "4",
				"IUSE" : "+flag",
				"KEYWORDS": "x86",
				"LICENSE": "GPL-2",
				"MISC_CONTENT": install_something,
			},
			"virtual/foo-0": {
				"EAPI" : "4",
				"KEYWORDS": "x86",
				"LICENSE": "GPL-2",
			},
		}

		installed = {
			"dev-libs/A-1": {
				"EAPI" : "4",
				"IUSE" : "+flag",
				"KEYWORDS": "x86",
				"LICENSE": "GPL-2",
				"RDEPEND": "flag? ( dev-libs/B[flag] )",
				"USE": "flag",
			},
			"dev-libs/B-1": {
				"EAPI" : "4",
				"IUSE" : "+flag",
				"KEYWORDS": "x86",
				"LICENSE": "GPL-2",
				"USE": "flag",
			},
			"dev-libs/depclean-me-1": {
				"EAPI" : "4",
				"IUSE" : "",
				"KEYWORDS": "x86",
				"LICENSE": "GPL-2",
#.........这里部分代码省略.........

	def testSimple(self):

		debug = False

		install_something = """
S="${WORKDIR}"

pkg_pretend() {
	einfo "called pkg_pretend for $CATEGORY/$PF"
}

src_install() {
	einfo "installing something..."
	insinto /usr/lib/${P}
	echo "blah blah blah" > "${T}"/regular-file
	doins "${T}"/regular-file
	dosym regular-file /usr/lib/${P}/symlink || die

	# Test CONFIG_PROTECT
	insinto /etc
	newins "${T}"/regular-file ${PN}-${SLOT%/*}

	# Test code for bug #381629, using a copyright symbol encoded with latin-1.
	# We use $(printf "\\xa9") rather than $'\\xa9', since printf apparently
	# works in any case, while $'\\xa9' transforms to \\xef\\xbf\\xbd under
	# some conditions. TODO: Find out why it transforms to \\xef\\xbf\\xbd when
	# running tests for Python 3.2 (even though it's bash that is ultimately
	# responsible for performing the transformation).
	local latin_1_dir=/usr/lib/${P}/latin-1-$(printf "\\xa9")-directory
	insinto "${latin_1_dir}"
	echo "blah blah blah" > "${T}"/latin-1-$(printf "\\xa9")-regular-file || die
	doins "${T}"/latin-1-$(printf "\\xa9")-regular-file
	dosym latin-1-$(printf "\\xa9")-regular-file ${latin_1_dir}/latin-1-$(printf "\\xa9")-symlink || die
}

pkg_config() {
	einfo "called pkg_config for $CATEGORY/$PF"
}

pkg_info() {
	einfo "called pkg_info for $CATEGORY/$PF"
}

pkg_preinst() {
	einfo "called pkg_preinst for $CATEGORY/$PF"

	# Test that has_version and best_version work correctly with
	# prefix (involves internal ROOT -> EROOT calculation in order
	# to support ROOT override via the environment with EAPIs 3
	# and later which support prefix).
	if has_version $CATEGORY/$PN:$SLOT ; then
		einfo "has_version detects an installed instance of $CATEGORY/$PN:$SLOT"
		einfo "best_version reports that the installed instance is $(best_version $CATEGORY/$PN:$SLOT)"
	else
		einfo "has_version does not detect an installed instance of $CATEGORY/$PN:$SLOT"
	fi
	if [[ ${EPREFIX} != ${PORTAGE_OVERRIDE_EPREFIX} ]] ; then
		if has_version --host-root $CATEGORY/$PN:$SLOT ; then
			einfo "has_version --host-root detects an installed instance of $CATEGORY/$PN:$SLOT"
			einfo "best_version --host-root reports that the installed instance is $(best_version $CATEGORY/$PN:$SLOT)"
		else
			einfo "has_version --host-root does not detect an installed instance of $CATEGORY/$PN:$SLOT"
		fi
	fi
}

"""

		ebuilds = {
			"dev-libs/A-1": {
				"EAPI" : "5",
				"IUSE" : "+flag",
				"KEYWORDS": "x86",
				"LICENSE": "GPL-2",
				"MISC_CONTENT": install_something,
				"RDEPEND": "flag? ( dev-libs/B[flag] )",
			},
			"dev-libs/B-1": {
				"EAPI" : "5",
				"IUSE" : "+flag",
				"KEYWORDS": "x86",
				"LICENSE": "GPL-2",
				"MISC_CONTENT": install_something,
			},
			"dev-libs/C-1": {
				"EAPI" : "6",
				"KEYWORDS": "~x86",
				"RDEPEND": "dev-libs/D[flag]",
			},
			"dev-libs/D-1": {
				"EAPI" : "6",
				"KEYWORDS": "~x86",
				"IUSE" : "flag",
			},
			"virtual/foo-0": {
				"EAPI" : "5",
				"KEYWORDS": "x86",
				"LICENSE": "GPL-2",
			},
		}
#.........这里部分代码省略.........

#.........这里部分代码省略.........
				#Create a minimal profile in /usr/portage
				sub_profile_dir = os.path.join(profile_dir, "default", "linux", "x86", "test_profile")
				os.makedirs(sub_profile_dir)

				if not (profile and "eapi" in profile):
					eapi_file = os.path.join(sub_profile_dir, "eapi")
					with open(eapi_file, "w") as f:
						f.write("0\n")

				make_defaults_file = os.path.join(sub_profile_dir, "make.defaults")
				with open(make_defaults_file, "w") as f:
					f.write("ARCH=\"x86\"\n")
					f.write("ACCEPT_KEYWORDS=\"x86\"\n")

				use_force_file = os.path.join(sub_profile_dir, "use.force")
				with open(use_force_file, "w") as f:
					f.write("x86\n")

				parent_file = os.path.join(sub_profile_dir, "parent")
				with open(parent_file, "w") as f:
					f.write("..\n")

				if profile:
					for config_file, lines in profile.items():
						if config_file not in self.config_files:
							raise ValueError("Unknown config file: '%s'" % config_file)

						file_name = os.path.join(sub_profile_dir, config_file)
						with open(file_name, "w") as f:
							for line in lines:
								f.write("%s\n" % line)

				#Create profile symlink
				os.symlink(sub_profile_dir, os.path.join(user_config_dir, "make.profile"))

		make_conf = {
			"ACCEPT_KEYWORDS": "x86",
			"CLEAN_DELAY": "0",
			"DISTDIR" : self.distdir,
			"EMERGE_WARNING_DELAY": "0",
			"PKGDIR": self.pkgdir,
			"PORTAGE_INST_GID": str(portage.data.portage_gid),
			"PORTAGE_INST_UID": str(portage.data.portage_uid),
			"PORTAGE_TMPDIR": os.path.join(self.eroot, 'var/tmp'),
		}

		if os.environ.get("NOCOLOR"):
			make_conf["NOCOLOR"] = os.environ["NOCOLOR"]

		# Pass along PORTAGE_USERNAME and PORTAGE_GRPNAME since they
		# need to be inherited by ebuild subprocesses.
		if 'PORTAGE_USERNAME' in os.environ:
			make_conf['PORTAGE_USERNAME'] = os.environ['PORTAGE_USERNAME']
		if 'PORTAGE_GRPNAME' in os.environ:
			make_conf['PORTAGE_GRPNAME'] = os.environ['PORTAGE_GRPNAME']

		make_conf_lines = []
		for k_v in make_conf.items():
			make_conf_lines.append('%s="%s"' % k_v)

		if "make.conf" in user_config:
			make_conf_lines.extend(user_config["make.conf"])

		if not portage.process.sandbox_capable or \
			os.environ.get("SANDBOX_ON") == "1":
			# avoid problems from nested sandbox instances

	def __init__(self, ebuilds={}, binpkgs={}, installed={}, profile={}, repo_configs={}, \
		user_config={}, sets={}, world=[], world_sets=[], distfiles={},
		eprefix=None, targetroot=False, debug=False):
		"""
		ebuilds: cpv -> metadata mapping simulating available ebuilds.
		installed: cpv -> metadata mapping simulating installed packages.
			If a metadata key is missing, it gets a default value.
		profile: settings defined by the profile.
		"""

		self.debug = debug
		if eprefix is None:
			self.eprefix = normalize_path(tempfile.mkdtemp())

			# EPREFIX/bin is used by fake true_binaries. Real binaries goes into EPREFIX/usr/bin
			eubin = os.path.join(self.eprefix, "usr", "bin")
			ensure_dirs(eubin)
			essential_binaries = (
				"awk",
				"basename",
				"bzip2",
				"cat",
				"chgrp",
				"chmod",
				"chown",
				"cp",
				"egrep",
				"env",
				"find",
				"grep",
				"head",
				"install",
				"ln",
				"mkdir",
				"mktemp",
				"mv",
				"readlink",
				"rm",
				"sed",
				"sort",
				"tar",
				"tr",
				"uname",
				"uniq",
				"xargs",
			)
			# Exclude internal wrappers from PATH lookup.
			orig_path = os.environ['PATH']
			included_paths = []
			for path in orig_path.split(':'):
				if path and not fnmatch.fnmatch(path, '*/portage/*/ebuild-helpers*'):
					included_paths.append(path)
			try:
				os.environ['PATH'] = ':'.join(included_paths)
				for x in essential_binaries:
					path = find_binary(x)
					if path is None:
						raise portage.exception.CommandNotFound(x)
					os.symlink(path, os.path.join(eubin, x))
			finally:
				os.environ['PATH'] = orig_path
		else:
			self.eprefix = normalize_path(eprefix)

		# Tests may override portage.const.EPREFIX in order to
		# simulate a prefix installation. It's reasonable to do
		# this because tests should be self-contained such that
		# the "real" value of portage.const.EPREFIX is entirely
		# irrelevant (see bug #492932).
		portage.const.EPREFIX = self.eprefix.rstrip(os.sep)

		self.eroot = self.eprefix + os.sep
		if targetroot:
			self.target_root = os.path.join(self.eroot, 'target_root')
		else:
			self.target_root = os.sep
		self.distdir = os.path.join(self.eroot, "var", "portage", "distfiles")
		self.pkgdir = os.path.join(self.eprefix, "pkgdir")
		self.vdbdir = os.path.join(self.eroot, "var/db/pkg")
		os.makedirs(self.vdbdir)

		if not debug:
			portage.util.noiselimit = -2

		self._repositories = {}
		#Make sure the main repo is always created
		self._get_repo_dir("test_repo")

		self._create_distfiles(distfiles)
		self._create_ebuilds(ebuilds)
		self._create_binpkgs(binpkgs)
		self._create_installed(installed)
		self._create_profile(ebuilds, installed, profile, repo_configs, user_config, sets)
		self._create_world(world, world_sets)

		self.settings, self.trees = self._load_config()

		self._create_ebuild_manifests(ebuilds)

		portage.util.noiselimit = 0

	def _create_profile(self, ebuilds, installed, profile, repo_configs, user_config, sets):

		user_config_dir = os.path.join(self.eroot, USER_CONFIG_PATH)

		try:
			os.makedirs(user_config_dir)
		except os.error:
			pass

		for repo in self._repositories:
			if repo == "DEFAULT":
				continue

			repo_dir = self._get_repo_dir(repo)
			profile_dir = os.path.join(repo_dir, "profiles")
			metadata_dir = os.path.join(repo_dir, "metadata")
			os.makedirs(metadata_dir)

			#Create $REPO/profiles/categories
			categories = set()
			for cpv in ebuilds:
				ebuilds_repo = Atom("="+cpv, allow_repo=True).repo
				if ebuilds_repo is None:
					ebuilds_repo = "test_repo"
				if ebuilds_repo == repo:
					categories.add(catsplit(cpv)[0])

			categories_file = os.path.join(profile_dir, "categories")
			f = open(categories_file, "w")
			for cat in categories:
				f.write(cat + "\n")
			f.close()

			#Create $REPO/profiles/license_groups
			license_file = os.path.join(profile_dir, "license_groups")
			f = open(license_file, "w")
			f.write("EULA TEST\n")
			f.close()

			repo_config = repo_configs.get(repo)
			if repo_config:
				for config_file, lines in repo_config.items():
					if config_file not in self.config_files and not any(fnmatch.fnmatch(config_file, os.path.join(x, "*")) for x in self.config_files):
						raise ValueError("Unknown config file: '%s'" % config_file)

					if config_file in ("layout.conf",):
						file_name = os.path.join(repo_dir, "metadata", config_file)
					else:
						file_name = os.path.join(profile_dir, config_file)
						if "/" in config_file and not os.path.isdir(os.path.dirname(file_name)):
							os.makedirs(os.path.dirname(file_name))
					f = open(file_name, "w")
					for line in lines:
						f.write("%s\n" % line)
					f.close()

			#Create $profile_dir/eclass (we fail to digest the ebuilds if it's not there)
			os.makedirs(os.path.join(repo_dir, "eclass"))

			if repo == "test_repo":
				#Create a minimal profile in /usr/portage
				sub_profile_dir = os.path.join(profile_dir, "default", "linux", "x86", "test_profile")
				os.makedirs(sub_profile_dir)

				if not (profile and "eapi" in profile):
					eapi_file = os.path.join(sub_profile_dir, "eapi")
					f = open(eapi_file, "w")
					f.write("0\n")
					f.close()

				make_defaults_file = os.path.join(sub_profile_dir, "make.defaults")
				f = open(make_defaults_file, "w")
				f.write("ARCH=\"x86\"\n")
				f.write("ACCEPT_KEYWORDS=\"x86\"\n")
				f.close()

				use_force_file = os.path.join(sub_profile_dir, "use.force")
				f = open(use_force_file, "w")
				f.write("x86\n")
				f.close()

				parent_file = os.path.join(sub_profile_dir, "parent")
				f = open(parent_file, "w")
				f.write("..\n")
				f.close()

				if profile:
					for config_file, lines in profile.items():
						if config_file not in self.config_files:
							raise ValueError("Unknown config file: '%s'" % config_file)

						file_name = os.path.join(sub_profile_dir, config_file)
						f = open(file_name, "w")
						for line in lines:
							f.write("%s\n" % line)
						f.close()

				#Create profile symlink
				os.symlink(sub_profile_dir, os.path.join(user_config_dir, "make.profile"))

#.........这里部分代码省略.........

	def testConfigProtect(self):
		"""
		Demonstrates many different scenarios. For example:

		 * regular file replaces regular file
		 * regular file replaces symlink
		 * regular file replaces directory
		 * symlink replaces symlink
		 * symlink replaces regular file
		 * symlink replaces directory
		 * directory replaces regular file
		 * directory replaces symlink
		"""

		debug = False

		content_A_1 = """
S="${WORKDIR}"

src_install() {
	insinto /etc/A
	keepdir /etc/A/dir_a
	keepdir /etc/A/symlink_replaces_dir
	keepdir /etc/A/regular_replaces_dir
	echo regular_a_1 > "${T}"/regular_a
	doins "${T}"/regular_a
	echo regular_b_1 > "${T}"/regular_b
	doins "${T}"/regular_b
	dosym regular_a /etc/A/regular_replaces_symlink
	dosym regular_b /etc/A/symlink_replaces_symlink
	echo regular_replaces_regular_1 > \
		"${T}"/regular_replaces_regular
	doins "${T}"/regular_replaces_regular
	echo symlink_replaces_regular > \
		"${T}"/symlink_replaces_regular
	doins "${T}"/symlink_replaces_regular
}

"""

		content_A_2 = """
S="${WORKDIR}"

src_install() {
	insinto /etc/A
	keepdir /etc/A/dir_a
	dosym dir_a /etc/A/symlink_replaces_dir
	echo regular_replaces_dir > "${T}"/regular_replaces_dir
	doins "${T}"/regular_replaces_dir
	echo regular_a_2 > "${T}"/regular_a
	doins "${T}"/regular_a
	echo regular_b_2 > "${T}"/regular_b
	doins "${T}"/regular_b
	echo regular_replaces_symlink > \
		"${T}"/regular_replaces_symlink
	doins "${T}"/regular_replaces_symlink
	dosym regular_b /etc/A/symlink_replaces_symlink
	echo regular_replaces_regular_2 > \
		"${T}"/regular_replaces_regular
	doins "${T}"/regular_replaces_regular
	dosym regular_a /etc/A/symlink_replaces_regular
}

"""

		ebuilds = {
			"dev-libs/A-1": {
				"EAPI" : "5",
				"IUSE" : "+flag",
				"KEYWORDS": "x86",
				"LICENSE": "GPL-2",
				"MISC_CONTENT": content_A_1,
			},
			"dev-libs/A-2": {
				"EAPI" : "5",
				"IUSE" : "+flag",
				"KEYWORDS": "x86",
				"LICENSE": "GPL-2",
				"MISC_CONTENT": content_A_2,
			},
		}

		playground = ResolverPlayground(
			ebuilds=ebuilds, debug=debug)
		settings = playground.settings
		eprefix = settings["EPREFIX"]
		eroot = settings["EROOT"]
		var_cache_edb = os.path.join(eprefix, "var", "cache", "edb")

		portage_python = portage._python_interpreter
		dispatch_conf_cmd = (portage_python, "-b", "-Wd",
			os.path.join(self.sbindir, "dispatch-conf"))
		emerge_cmd = (portage_python, "-b", "-Wd",
			os.path.join(self.bindir, "emerge"))
		etc_update_cmd = (BASH_BINARY,
			os.path.join(self.sbindir, "etc-update"))
		etc_update_auto = etc_update_cmd + ("--automode", "-5",)

		config_protect = "/etc"

#.........这里部分代码省略.........

#.........这里部分代码省略.........
			"GENTOO_COMMITTER_EMAIL" : committer_email,
			"HOME" : homedir,
			"PATH" : os.environ["PATH"],
			"PORTAGE_GRPNAME" : os.environ["PORTAGE_GRPNAME"],
			"PORTAGE_USERNAME" : os.environ["PORTAGE_USERNAME"],
			"PORTAGE_REPOSITORIES" : settings.repositories.config_string(),
			"PYTHONDONTWRITEBYTECODE" : os.environ.get("PYTHONDONTWRITEBYTECODE", ""),
		}

		if os.environ.get("SANDBOX_ON") == "1":
			# avoid problems from nested sandbox instances
			env["FEATURES"] = "-sandbox -usersandbox"

		dirs = [homedir, license_dir, profiles_dir, distdir]
		try:
			for d in dirs:
				ensure_dirs(d)
			with open(os.path.join(test_repo_location, "skel.ChangeLog"), 'w') as f:
				f.write(copyright_header)
			with open(os.path.join(profiles_dir, "profiles.desc"), 'w') as f:
				for x in profiles:
					f.write("%s %s %s\n" % x)

			# ResolverPlayground only created the first profile,
			# so create the remaining ones.
			for x in profiles[1:]:
				sub_profile_dir = os.path.join(profiles_dir, x[1])
				ensure_dirs(sub_profile_dir)
				for config_file, lines in profile.items():
					file_name = os.path.join(sub_profile_dir, config_file)
					with open(file_name, "w") as f:
						for line in lines:
							f.write("%s\n" % line)

			for x in licenses:
				open(os.path.join(license_dir, x), 'wb').close()
			with open(os.path.join(profiles_dir, "arch.list"), 'w') as f:
				for x in arch_list:
					f.write("%s\n"